An impermeable fabric double-walled, air-inflatable, self-supporting structure of a predetermined shape. One end of the structure, when installed, forms an airtight joint at the shelter to the pressurized entrance. The other end of the structure facilitates expanding the system. The shelter is stored and transported in the trailer when not in use. It is a component of the SHELTER SYSTEM, COLLECTIVE PROTECTION, CHEMICAL-BIOLOGICAL, specifically designed to house 10 men.